The Amphipoda of Bermuda. 



15 



first, cylindrical ; third joint short, hardl}' to be distinguished from 

 first segment of flagellum, which is made up of about 20 segments 

 which are longer than broad ; no accessory flagellum. Second an- 

 tennae slightly shorter than first ; peduncle nearly as long as flagellum ; 

 fourth joint somewhat longer than fifth. 



Mandibles rather broad, without palp and molar tubercle ; prin- 

 cipal and secondary cutting edges denticulated ; numerous spines in 

 spine row. First maxillae with inner plate small, triangular, furnished 

 with single setule apically ; outer plate short, tapering slightly toward 

 apex, with very minute setules on inner margin and 4 or 5 stout 



Fig. 4. Stenothoe marina (Bate). 



spines on apical margin ; palp stout, 2-jointed, with second joint 

 rounded and provided with numerous teeth and spines apically, 

 proximal joint only slightly shorter than second. Second maxillae 

 with plates normally developed, but with inner plate having a single 

 setule. Maxillipeds with inner plate reduced to a slight eminence and 

 (Hiter plate entirely absent so that maxilliped appears to be made 

 up of very small inner plate and a 5-jointed palp, of which all the 

 joints are cylindrical except the terminal one which tapers to a 

 slender point and bears fine cilia on the inner margin. 



In male, first gnathopods much smaller than second ; epimeron 

 moderate in size ; second joint long and slender of uniform width 

 throughout ; third joint cylindrical, slightly longer than broad ; fourth 

 joint large, more or less cup-shaped with distal margin long and 

 oblique and posterior margin, which bears a few spines, much longer 



